Induction Part 2

Induction

Experimental setup picture As you can see, the light bulb flashes the moment you connect the switch to the battery.
The explanation is, that the magnetic field coming from the upper electromagnet induces a magnetic field in the lower iron core.
The change in that magnetic field, in turn induces an electric current in the lower coil.
You should note that the current in the lower coil ceases once the magnetic field has stabilised.
If you switch off the current, you get another flash, because the magnetic field in the upper electromagnet no longer maintains the field in the lower iron core. The change in the field in the lower core induces another current, and makes the light bulb flash again.
In order to apply your knowledge of electromagnetism and induction, you may now return to the page on wind turbine generators.